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Study on Methods for Removal and Concentration of Metal Ions Solved in Water Using Macro-Molecules

高分子去除和富集水中溶解金属离子方法的研究

基本信息

批准号：
13480178
负责人：
TOMIDA Tahei
金额：
$ 7.87万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13480178/
关键词：
Metal ions Chelating polymer Microcapsule Complexation Separation Membrane filtration Immobilization calcium phosphate

项目摘要

1. Water-soluble chelating polymers, poly(α-acethylaminoacrylic acid) (abbreviation : P4A) and poly(N-methacryloyl-L-alanine) (abbreviation : PMLA) were prepared. The weight average molecular weight of P4A and PMLA were 1100000 and 2200000, respectively. Binding equilibria of P4A and PMLA with divalent metal ions (Co(II), Ni(II), Cu(II), Zn(II), Pb(II)) were measured by a batch ultrafiltration method in the pH range 4-6. It was shown that the binding equilibrium curves were reasonably well represented by the complexation model proposed previously. The equilibrium and successive stability constants were determined by fitting the binding curves calculated from the model to the experimental ones at every solution pH.2. Microcapsules .containing 2-ethylhexyl 2-ethylhexyl. Phosphonate(PC88A) were prepared by an insitu polymerization of divinyl benzene with water-oil-water emulsion. Almost all the microcapsules prepared were spherical with diameters of 200-300 μm (SEM observation). Adsorption equilibria of rare earth metal ions were measured in the pH range 1-4. It was shown that the microcapsules adsorbed rare earth metal ions even in acidic solution of pH 2-3. From these results, the microcapsules seem to be useful to recover or concentration metal ions dissolved in water.3. Immobilization of metal ions dissolved in water was examined with calcium phosphate, calcium hydrogen phosphate and calcium dihydrogen phosphate. Lead ions were favorably removed with these three kinds of phosphates, but Co(II), Cu(II) and Cd(II) were removed with only calcium hydrogen phosphate. The immobilization of metal ions with phosphates was discussed based on a dissolution-precipitation mechanism.

1.合成了水溶性螯合聚合物聚（α-乙酰氨基丙烯酸）（简称P4 A）和聚（N-甲基丙烯酰-L-丙氨酸）（简称PMLA）。P4 A和PMLA的重均分子量分别为110万和220万。通过分批超滤法在pH 4-6范围内测量P4 A和PMLA与二价金属离子（Co（II）、Ni（II）、Cu（II）、Zn（II）、Pb（II））的结合平衡。结果表明，结合平衡曲线是合理的，以及由以前提出的络合模型。平衡和连续的稳定常数，通过拟合的结合曲线计算模型的实验在每个解决方案的pH值。含2-乙基己基2-乙基己基的微胶囊。以二乙烯基苯为原料，采用水-油-水乳液原位聚合法合成了膦酸酯（PC 88 A）。所制备的微胶囊几乎都是球形的，粒径在200-300 μm之间（SEM观察）。在pH 1-4范围内测定了稀土金属离子的吸附平衡。结果表明，该微胶囊即使在pH 2-3的酸性溶液中也能吸附稀土金属离子。从这些结果来看，微胶囊似乎是有用的回收或浓缩溶解在水中的金属离子.研究了磷酸钙、磷酸氢钙和磷酸二氢钙对水中金属离子的固定作用。这三种磷酸盐均能有效去除铅离子，但仅磷酸氢钙能有效去除Co（II）、Cu（II）和Cd（II）。基于溶解-沉淀机理讨论了磷酸盐对金属离子的固定化。